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Flux
Flux is a finite element software for low-frequency electromagnetic and thermal simulations. Both, 2D and 3D solutions are available...
Co-simulation between Flux and another software
Flux is able to couple with several softwares allowing to model mutliphysics phenomena.
Multiphysics co-simulation: principles
Multiphysics co-simultation: what Flux models
Multiphysics co-simulation: definitions

Welcome
User guide
The user guide gives information about principles and how to use Altair® Flux® 2024.1.
What's new?
See the release notes of the last and previous versions, with the necessary information on new features.
"How to" Documents
See a list of documents to understand how to use certain features.
Altair Flux Videos
Several youtube videos about how to use Altair Flux and several tip and tricks
Flux Supervisor
The Flux supervisor allows to run projects, examples, pythons scripts; to configure user preferences; to access tools...
Flux
Flux is a finite element software for low-frequency electromagnetic and thermal simulations. Both, 2D and 3D solutions are available...
- General operation
  Here is a presentation of the Flux environment; the project management, the data management, the command language, the formulas and mathematical functions.
- Construction of a Flux project
  The construction of a Flux project consists of several stages: Geometry → Mesh → Physics → Resolution → Postprocessing; with the possibility to import a CAD file, a mesh, materials...
- Physical applications
  Flux allows to model different physical phenomena, and includes various applications (magnetic, electrical, thermal and thermal coupled).
- Circuit and Kinematic Couplings
  Flux is coupled to a circuit context allowing to model the sources of the devices.Flux also allow to model the movement via a kinematic coupling.
- Co-simulation between Flux and another software
  Flux is able to couple with several softwares allowing to model mutliphysics phenomena.
- Dedicated couplings
  Several dedicated couplings are implemented in Flux to, carry out vibro-acoustic studies, magneto-thermal studies and more.
- 3D Overlay
  Flux has predefined models for rotating machines via Overlays allowing to describe a geometry, a mesh and a physics adapted to the wished machine.
- Flux API
- How to Configure the Memory in Flux?
Flux Skew
Flux Skew is a module dedicated to the analysis of rotating electric machines with skewing, allowing a straightforward geometric and physical description in 2D and the consideration of continuous or step skewing effects.
Flux PEEC
Flux PEEC is a 3D modeling module dedicated to electrical interconnections of power electronics devices. It also provides RLC extraction and generation of SPICE-like equivalent circuits.
Material Identification
The Material Identification tool is based on the Altair Compose environment and allows determining from measurements the parameters and coefficients required to create a material in Flux.
Altair Material Datacenter (AMDC)
AMDC is a comprehensive material database maintained by Altair and partner suppliers of engineering materials. Ready-to-use, Flux-compatible models may be obtained directly from this database for a growing number of materials.
Material Manager
Flux has a material manager with its own material base.The user can create his own material base and import them into the Flux models to be studied.
Flux e-Machine Toolbox
FeMt is a application in Flux dedicated for Electric Machine which permits to compute and postprocess results like efficiency maps.
Flux Examples
See the lists of examples 2D, 3D, SKEW and PEEC with all available documents and all project and python files.
Flux in SimLab Examples
See the lists of 2D and 3D SimLab examples using the Flux and Mipse solvers, with all available documents, *.slb databases and all script files.
Mementos
See a list of Memento documents to understand certain Flux features.
Macros
Flux proposes several macros enabling doing actions that are not yet implemented in Flux.
PyFlux Documentation (Beta version)
This documentation deals with the Jython script used in Flux and allows to understand the various structures of entities and functions, and use it in user scripts for example.
Flux installation guide
This document provides instructions for Flux installation on supported platforms.
Flux Starting Guide
Several short videos to start with Flux.

Multiphysics co-simulation: definitions

Introduction

Generally, the term coupling is used when we wish to study, for a given device, several physical phenomena: electrical, magnetic, thermal, mechanical...

Each phenomenon is described by an equation (equations of Maxwell, equation of Fourier, circuit equation, mechanical equation...). Therefore, the coupling requires that a more complex system of equations be solved.

Strong / weak coupling: definitions

In general we speak about:

a strong coupling: when a simultaneous solving process of two systems of equations is carried out (example: in case of the field-circuit coupling, the equations of the magnetic field and the circuit equations are solved simultaneously)
a weak coupling: when the two systems of equations are solved independently , which imposes the data transfer from one system to another (example: in case of the kinematic coupling, the equations of the magnetic field and the mechanics equations are successively solved for each time step).

A strong coupling can be carried out only internally (within the software). A weak coupling can be realized internally (within the software) or in association (combination) with other software items.

Couplings proposed in Flux

The couplings proposed in Flux are the following:

circuit coupling (strong coupling)
kinematic coupling (weak coupling)

These couplings are entirely incorporated and available in the form of Flux modules (functionalities proposed by the software).

Co-simulation

In order to carry out the coupling with other items of software, new functionalities allowing the external data exchange.

We speak about multiphysics co-simulation.

Examples

Examples of software items which can be coupled with Flux:

FLUENT: software of numerical simulation of fluids flows (Computational Fluid Dynamics: CFD)
EMTP: software of simulation of transient electromagnetic phenomenon in the electrical networks.
MpCCI: software for the coupling of various simulation codes
Flux: for instance Magneto-Thermal co-simulation